Malicious PDF — malware analysis report

Static analysis result for SHA-256 70455063bc2aa724…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 07:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c262ffa32a58377257b51429736e09c0 SHA-1: 44041d80b46c3733492443cd50082e5f1b52fc3b SHA-256: 70455063bc2aa72408cf084c7abb181713b1c4aacc705b23994392151a172d12
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random URL links and being part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. While no scripts were explicitly extracted, the embedded URLs point to potentially malicious content, and the document structure suggests it's designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tonere.shop/app/webroot/files/userfiles/files/fawipevuwibujivoz.pdf In PDF document text
    • http://softtox.pl/new/userfiles/file/18188802022.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/72501664230.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/fajofatebudikemidufenobe.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd64f47a0e---76236716045.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/regizul.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/28640939320.pdfIn PDF document text
    • https://primer-spb.ru/files/files/kuridanu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/45558423014.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdfIn PDF document text
    • https://ka-base.no/images_content/file/33206199274.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/9176412397.pdfIn PDF document text
    • http://vce34.ru/attachments/file/nakakegizedu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/af3ee57e1eefb2f78a191bdeb96384f6/49515336822.pdfIn PDF document text
    • https://somogyplusz.hu/files/1463656852.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/84262137943.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/waxeruzenolijejezubijiduw.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/76312147920.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210907124953.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/rizipixe.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/funefale.pdfIn PDF document text
    • http://unseretochter.ch/images/file/niberireliminosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+harry+potter+and+the+order+of+the+phoenix+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 10760 bytes
SHA-256: 52d51aee5910f6ff94a56c2cf3b7945eed30c1ad9f9eb2e8ce7795429807c781
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 18524 bytes
SHA-256: 23c892e466aad5e53d542acfa6dc6d2d6704b1c20870ca3d892bdda2d8bfea40